Bush and bog harrow



Dec. 15, 1953 F. D. SAWYER BUSH AND BOG HARROW Filed Sept. 21, 1951 Patented Dec. 15, 1953 BUSH AND BOG HARROW Frederick D. Sawyer, Wayne, Mich., assignor to Dearborn Motors Corporation, Birmingham, Mich., acorporation of Delaware Application September 21, 1951, Serial N 0. 247,597

1 Claim. 1

This invention relates to an improved implement hitch and particularly a hitch for connecting the so-called lift type implements to a well-known type of tractor havin three laterally and vertically spaced, power lifted hitch links.

The connection of various farm implements to a Well-known type of tractor having a pair of laterally spaced, power-lifted hitch links and a centrally disposed top link has heretofore been conventionally accomplished by providing a pair of laterally projecting pins on the frame'of such implement adapted respectively to connect to the two lower hitchlinks, and providing an upstanding frame structure on the implement defining at its top a pivotal connection to the free end of the tractor top link. Such hitching arrangement is generally integral with or rigidly bolted to the implement, the A-frame in particular being welded to the frame structure of the implement. When it is considered'that there are a large variety of implements usable with this type of tractor, and that all of such implements have heretofore incorporated substantially identical hitching structures, it becomes apparent that there are definite advantages residing in the provision of a hitch frame structure which may be conveniently attached to any one of a plurality of different implements and thus avoid the duplication of providing a hitch structure on each implement. Furthermore, there is always a need for providing the most economical form of a hitch frame structure for any individual implement.

Accordingly, it is an object of this invention to provide an unusually simple, economically manufacturable hitch structure for an implement to adapt such implement for connection to a tractor of the type having laterally and vertically spaced, power-lifted hitch links.

Still another object of this invention is to provide a hitch frame structure for lift type implements which may be selectively and conveniently applied to any one of a plurality of different types of implements, thereby eliminating the'necessity of each implement having a hitch frame integrally associated therewith.

The specific nature of this invention, as well as other objects and advantages thereof, will become apparent to those skilled in the art from the following detailed description, taken in conjunction with the attached sheet of drawings on which, by way of preferred example only, is illustrated one embodiment of this invention.

On the drawings:

Figure 1 is a side elevational view of an implement incorporating a hitch frame constructed in accordance with this invention, shown in assemled relationship to the rear end of a tractor.

Figure 2 is an enlarged detail perspective view of the hitch frame and implement frame detached from the tractor.

Figure 3 is an enlarged detail cross sectional view taken along the plane 3-3 of Figure 2.

As shown on the drawings:

As was indicatedabove, the hitch frame embodying this invention may be conveniently applied to any one of a plurality of different types of farm implements'such asplows, disc harrows, Cultivators, rotary hoes, weeders, planters, etc. All of such implements conventionally embody a main frame structure comprising a pair of longitudinally spaced, transversely disposed members. This invention will be particularly described and illustrated in connection with this application to a disc harrow of the type more fully described and claimed in'my co-pending application, Serial No. 203,185, filed-December 2 8, 1950; Such disc harrow comprises a main transverse frame member H of solid bar stock bent into an angular or V-construction corresponding to the desired working angle of a pair of disc gangs I5 which are mounted beneath such bar as-wm be later described. The ends Ila of member II are squared off perpendicular to the axes of such ends and a pair of dependingplate-like arm I2 are respectively conveniently secured by welding to the squared off ends I la of bar I l. Depending arms 12 are utilized to support the outer ends of the pair of disc gangs l5. "Each disc gang l5 comprises the usual disc blades [5a mountedin axially spaced relationship by suitable spacers (not shown) on a shaft or gang bolt 20. *Adjacent the ends of each gang bolt 20, a bearing 21 (only one of which is shown) is provided which surrounds the end portions of each of such gang bolts. Bosses 21a are provided on each of the bearings 2| and a pair of vertically disposed bolts 2Ib in such bosses secure the bearing caps of bearing 2! about the gang bolt 20 in a well-known manner and such bolts likewise secure an angle lug 22 to the top of each boss 2la.

Depending arms l2 are respectively weldedat their lower ends to the angle lugs 22 provided on the outermost ends of disc gangs I5. vA pair of vertical depending arms 23, which also comprise plate-like members, are respectively welded at their upper ends to the underside of bar member II on opposite sides of the vertex H0. The

lower ends of arms 23 are respectively welded to the innermost angle lugs 22 provided on the inner bearings 2| (not shown) of the disc gangs l5.

A horizontally disposed, substantially U-shaped bracket [3 is provided having rearwardly diverging arms l3a whichare respectively welded itoa medial portion of the depending arms l2. Such arms diverge somewhat, as shown in Figure 4, to facilitate securing the ends thereof to the depending arms H. The bight portion I3b of bracket I2 is forwardly facing, as bestshown in Figures 1 and 2. A pair of transversely spaced angle lugs H are welded to the forwardly facing bight portion |3b of bracket 13, as best shown in 3 Figure 4 Additionally, an upstanding lug H1) is weldedtothe top of the vertex portion No of the V-shaped bar member ll.

Those skilled in the art will recognize that a large number of other types of implements are conventionally provided with longitudinally spaced, transverse frame members such as V- shaped bar member I I and the bracket 13. In the application of this invention to any one of such plurality of implements, the forward transverse frame member is also provided with the transversely spaced lugs [4 while the rear transverse frame member is provided with a lug similar to the upstanding lug llb.

In accordance with this invention, a hitch frame I! is provided comprising a generally triangular structure having a tubular element Ila formingits base portion and a pair of upstanding inwardly sloped side members Nb and Ho.

The top ends of side members [1b and [1c are bent to define laterally spaced vertical end portions Nd and He between which one end of a brace link [8 is mounted as by a bolt IS. A plurality of transverse holes [81) are provided in longitudinally spaced relationship in the lower end of brace l8, whereby such link may be secured to the lug Ilb on the implement as by a bolt 18c traversing such lug and a selected hole lab. Thus, the effective length may be conveniently varied. The width of the bottom portion of the triangular hitch frame IT is proportioned so as to fit snugly between the forwardly projecting lugs H. Lugs [4 are respectively provided with aligned apertures Ma and the hitch frame I! is secured to such lugs by passing a rod l6 through I the apertures (4a and the .bore of the tubular element Ha. The rod I6 is of such length so thatits ends IBa respectively project beyond the lugs 14 and such ends l6a are suitably shaped so as to mount the trailing ends of the tractor hitch links 25 thereon, as will be presently described.

In order to prevent lateral shifting of the inserted rod 16 with respect to the hitch frame, a suitable transverse hole is drilled through both the tubular element Ila and the inserted rod l6 and a cotter pin 35 is inserted therein. Thehitch frame embodying this invention is utilized for the connection of implements to a tractor of wellknown make having a pair of laterally spaced,

draft links pivoted to the rear axle housing 26 as at 21. The trailing ends of draft links .25 are provided with a universally swiveling spherical joint connection 25a which are respectively mountable on the ends of .rod [6. A suitable linch pin 28 secures the draft links 25, when mounted on rod [6,.- against displacement. .Draft links 25 are vertically raised by a pair of transversely spaced rocker arms 29 secured to the ends of a rock shaft 30 mounted on top of the tractor transmission housing. The ends of rocker arms 29 are respectively connected to .a pair of links 2| which are in turn connected to a medial portion of draft links 25 whereby draft links 25 are lifted. -A top link 32 is pivotally connected at its forward end -to a lug member-33 provided'on top of axle housing '26 while the rear end of top link. 32 is pivotally connected between the vupstanding end portions IIc of arm I] by a transverse pinor bolt 34. Rocker arms 29 are rotated by a built-in hydraulic mechanism (not shown) and such mechanism is controlled by a. manually operated hydraulic control lever, also .not shown. Thus by manipulation of such lever the tractor operator can easily and conveniently raise. or-low- 4 er draft .links 25 to raise the harrowto a transporting position or lower them and a connected implement to a ground engaging position.

Under some conditions, and with certain implements, it is desirable to effect a somewhat lower effective point of connection of the tractor hitch-links 25 with the implement. This may :be conveniently accomplished by providing additional holes a in the forwardly projecting lugs H in vertically spaced relationship. The hitch frame I! may then be connected by the inserted rod 16 at any desired level with respect to the implement by suitable selection of the holes in the lugs l4 through which the rod I6 is passed.

From the foregoing description, it is obvious that the hitch frame I! may be conveniently detached .from the illustrated disc harrow and attached to another type of implement provided with attaching lugs similar to the lugs 14 and l lb. Hence the manufacturing cost of a large number of implements may be substantially reduced by designing them to mount the hitch frame structure embodying this invention.

It will, of course, be understood that various details of construction may be varied through a wide range without departing from the principles of this invention and it is, therefore, not the purpose to limit the patent grantedhereon otherwise than necessitated by the scope of the appended claim.

I claim:

A hitch for connecting an implement to a tractor having a pair of laterallyspaced, trailing lower hitch links and a vertically spaced trailing top link, comprising a pair of brackets adapted for connection to the implement. in laterally spaced relationship, each of said brackets having a plurality of vertically spaced transverse holes therein respectively aligned with the holes of the other bracket, a vertically disposed, generally triangular, rigid hitch frame .having a bottom tubular member insertable betweensaid brackets, a .rod freely inserted through a selected aligned pair of said holes andsaid tubular member, thereby pivotally securing saidhitch frame to the implement at a selected vertical height relative to the implement, said rod having the ends thereof respectively projecting beyond said brackets-and adapted for connection respectively to the lower tractor. hitch links, an adjustable length brace element connected between the top portion of said hitch frame and the implement to rigidify said hitch frameand the implement, and means on the top portion of said hitch frame adapted for connection to the tractor top link.

FREDERICKD. SAWYER.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,566,831 Clement Dec. 22, 1925 1,727,262 Wolfe -Sept. 3, 1929 1,807,379 Burrows May 26,1931 1,848,359 Krause Mar. 8, 1932 1,880,075 Davis Sept.2'7, 1932 2,341,807 Olmstead Feb. 15, 1944 2,456,693 Fraga 'Dec. 21, 1948 2,532,637 Newkirk Dec. 5, 1950 2,575,622 Fraga Nov. 20, 1951 FOREIGN PATENTS Number Country Date 359,433 .Great Britain Oct. 19, 1931 

